Mercedes-Benz W126 (1979–1991)

The Mercedes-Benz W126 S-Class, produced from 1979 to 1991, is widely considered one of the greatest luxury cars ever built. Chief engineer Bruno Sacco created a body of exceptional elegance that has aged magnificently. The W126 was engineered to last — its build quality, passive safety and mechanical durability were unprecedented. The range spans the short and long-wheelbase saloons from the 280SE through to the 560SEL, and the magnificent SEC coupe in 380, 420, 500 and 560 forms. The 560SEC is the pinnacle — a six-metre grand tourer with 300bhp and effortless refinement. Many W126s have exceeded one million kilometres in original specification. The W126 Club and global specialist network provide comprehensive support. Rust is minimal on well-maintained examples.

Available body styles: Saloon, Coupe (SEC). Produced from 1979 to 1991.

Which variant to buy?

The W126 was produced in 5 main variants. The most powerful option is the 560SEC/SEL (M117) with 300 hp (M117.968 engine). When buying, always verify the engine code matches the claimed variant — swapped engines are common on classic cars of this era.

What to check before buying

Based on 4 reported fault cases, the most important pre-purchase checks for the W126 are:

• W126 M117 V8 oil leak from cam cover gaskets ✅ Known fix available
• W126 W107 SL brake hard line corrosion ✅ Known fix available
• W126 automatic transmission 722.3 second gear start ✅ Known fix available
• W126 SEC rear window seal leaking ✅ Known fix available

Is the W126 reliable?

Of the 4 fault cases recorded for the Mercedes-Benz W126 on MyCarFault, 100% have a verified fix. Regular maintenance, correct service intervals and addressing known weak points early significantly extends the life of these vehicles.